Cold Rolling Tool Units With Inclined Rods for Conicity Compensation
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Solution Overview
Problem
Cold rolling machines often produce profiles that undergo conical deformation or distortion during hardening, resulting in dimensions that do not meet desired specifications, leading to dimensional issues in non-rotatable connections.
Innovation Solution
A cold rolling machine with two tool units, each equipped with a roller bar and a swivel support that can pivot about a longitudinal axis, allowing for precise adjustment of the angle of inclination between the roller rod profiles to compensate for conical distortions and ensure the profile's conicity falls within a predetermined tolerance range after hardening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the workpiece is hardened after cold rolling to increase strength, then the connection strength is improved, but conical deformation or distortion of the profile occurs
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-setting the inclination angle of the rolling bar profiles before the cold rolling process. This preliminary configuration compensates for the anticipated conical deformation that will occur during subsequent hardening, ensuring the final profile achieves the desired cylindrical geometry after hardening without requiring additional corrective operations
2Shape
If the rolling bar profiles are aligned parallel to each other to produce cylindrical profiles, then the profile shape is improved, but conical distortion occurs after hardening that takes the profile out of tolerance
Solution Approach 1:
The patent applies preliminary anti-action by intentionally setting the rolling bar profiles at a specific inclination angle relative to the workpiece axis before rolling. This preliminary misalignment creates a compensatory effect that counteracts the conical deformation occurring during hardening, resulting in a final cylindrical profile within tolerance
3Manufacturing precision
If the angle of inclination between rolling bar profiles is adjusted to compensate for hardening distortion, then manufacturing precision is improved, but device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The patent applies parameter changes by modifying the inclination angle parameter of the rolling bar profiles. Instead of complex multi-axis adjustment mechanisms, the invention changes this single geometric parameter to achieve compensation for hardening distortion, thereby maintaining relative simplicity of the device while improving manufacturing precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The machine effectively compensates for conical distortions caused by hardening, ensuring the produced profiles meet dimensional requirements, reducing rejects and maintaining the desired cylindrical shape.
Implementation Method 1
at least a section of a workpiece is deformed, creating a profile that extends circumferentially around the workpiece
Implementation Method 2
The swivel carrier is pivotally mounted on the machine frame about a pivot axis by means of a swivel bearing assembly. By pivoting about the respective axis, an angle of inclination can be set between the rolling bar profiles
Data Source
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AI summary
The invention relates to a cold rolling machine (10) and to a method for producing a profile on a workpiece (14). The cold rolling machine (10) has two preferably identically constructed tool units (12, 13). Each tool unit (12, 13) has at least one rolling rod (19) extending in the longitudinal direction (L), a tool slide (21), a slide drive device (25), a pivoting carrier (33) and a pivot drive (38). The at least one rolling rod (19) is fastened to the tool slide (21) and can be moved in the longitudinal direction (L) by means of the slide drive device (25). The pivoting carrier (33) can be pivoted about a pivot axis (S1, S2) extending in the longitudinal direction (L) by means of the pivot drive (38). The tool slide (21) is arranged on the pivoting carrier (33). An angle of inclination (α) can thereby be set between the two rolling rods (19), which angle of inclination can have, for example, a value of 0 degrees to 2.0 degrees or to 0.2 degrees. Conical profiles can thereby be produced in the workpiece (14).